Material properties of high-strength beryllium-free copper alloys

Altenberger, I.; Kuhn, H.-A.; Müller, H. R.; Mhaede, Mansour; Gholami–Kermanshahi, Mozghan; Wagner, Lothar

doi:10.1504/ijmpt.2015.067820

Cited by 28 publications

(22 citation statements)

References 17 publications

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“…By combining these processes with a final mechanical surface treatment (such as shot peening, laser peening or deep rolling) even higher fatigue strengths of about 400 MPa can be achieved [18]. Higher fatigue strengths for copper alloys are only reported for high-alloyed spray-formed copper alloys and Cu-Be alloys [19]. Figure 14.…”

Section: Resultsmentioning

confidence: 99%

Ultrafine-Grained Precipitation Hardened Copper Alloys by Swaging or Accumulative Roll Bonding

Altenberger

Kuhn

Gholami

et al. 2015

Metals

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Abstract:There is an increasing demand in the industry for conductive high strength copper alloys. Traditionally, alloy systems capable of precipitation hardening have been the first choice for electromechanical connector materials. Recently, ultrafine-grained materials have gained enormous attention in the materials science community as well as in first industrial applications (see, for instance, proceedings of NANO SPD conferences). In this study the potential of precipitation hardened ultra-fine grained copper alloys is outlined and discussed. For this purpose, swaging or accumulative roll-bonding is applied to typical precipitation hardened high-strength copper alloys such as Corson alloys. A detailed description of the microstructure is given by means of EBSD, Electron Channeling Imaging (ECCI) methods and consequences for mechanical properties (tensile strength as well as fatigue) and electrical conductivity are discussed. Finally the role of precipitates for thermal stability is investigated and promising concepts (e.g. tailoring of stacking fault energy for grain size reduction) and alloy systems for the future are proposed and discussed. The relation between electrical conductivity and strength is reported.

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Section: Resultsmentioning

confidence: 99%

Ultrafine-Grained Precipitation Hardened Copper Alloys by Swaging or Accumulative Roll Bonding

Altenberger

Kuhn

Gholami

et al. 2015

Metals

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“…In that way, copper alloys are widely used although the enhancement of mechanical properties usually comes along with a decrease of the electrical performances [1,2]. To face this problem, oxide-dispersion-strengthened (ODS) copper alloys, where aluminium oxide nanoparticles are dispersed in the matrix, is one of the existing solutions [3][4][5]. However, their mechanical properties might not be enough for the cited applications.…”

Section: Introductionmentioning

confidence: 99%

“…But due to the price and the toxicity of beryllium and its compounds, alternative copper alloys have been formulated. Cu-Ni-Si alloys, with a nickel content from 1.5 to 8.0 wt.% and a quantity of silicon included between 0.3 and 1.8 wt.%, are known to be one of the best replacement options [4][5][6]. Their good property balance is mostly attributed to the formation of nanosized disc-shaped coherent δ-Ni 2 Si precipitates identified by transmission electron microscopy (TEM) [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Low cycle fatigue behaviour of a precipitation hardened Cu-Ni-Si alloy

Delbove

Vogt

Bouquerel

et al. 2016

International Journal of Fatigue

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Low cycle fatigue tests were performed at room temperature to investigate the role of the microstructure of a Cu-Ni-Si alloy on the stress response to strain cycling and on the fatigue resistance. The cyclic accommodation consisted in a hardening followed by a softening. TEM analysis showed that in some grains dislocations remained isolated and confined between precipitates while in other grains dislocations piled up at δ-Ni 2 Si precipitates and then cut them. Repetitive cutting allows their dissolution and formation of precipitate-free bands where the plastic deformation is localised. The Manson-Coffin diagram exhibited two regimes according to the proportion of grains involved in the plastic deformation accommodation. Keywords copper alloys-cyclic properties-low cycle fatiguemicrostructure-microscopy Highlights Investigated Cu-Ni-Si contains δ-Ni 2 Si nano precipitates-Cyclic hardening followed by softening is observed-Dissolution of δ-Ni 2 Si results from repetitive cutting-Deformation is localised in precipitate-free bands Highlights Investigated Cu-Ni-Si contains a high density of δ-Ni Si precipitates-Cyclic hardening followed by softening is observed-Dissolution of δ-Ni 2 Si results from repetitive cuttinglocalisation of deformation in precipitate-free bands

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“…Additionally, this model predicts an equal proportion of LPand MP-TTGs during the Archean, which contrasts with the preserved rock record. 2006; Heidarzadeh et al, 2014;Wu et al, 2014;Altenberger et al, 2015), as well as geological laboratory experiments related to different rock compositions (Evans and Goetze., 1979;Long et al, 2011;Sygała et al, 2013;Idrissi et al, 2016;Hansen et al, 2019). Therefore, owing to the hotter thermal structure and different crustal composition of Archean lithosphere relative to the present-day crust (Chardon et al, 2009;Dhuime et al, 2015;Tang et al, 2016;Brown et al, 2020), it is expected to have a lower yield strength.…”

Section: Yield Stress Of the Archean Lithospherementioning

confidence: 99%

Calibrating the Yield Strength of Archean Lithosphere Based on the Volume of Tonalite-Trondhjemite-Granodiorite Crust

Gunawardana¹,

Morra

Chowdhury³

et al. 2020

Front. Earth Sci.

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Lithospheric yield stress is a key parameter in controlling tectonic processes. Using high resolution, 2D numerical modeling, we calculate the yield stress for a range of conditions appropriate to the early-to-mid Archean Earth, including hotter mantle potential temperatures and Moho temperatures. We then evaluate its effect on generating tonalite-trondhjemite-granodiorite (TTG) crust and benchmark the results against the preserved igneous rock record. Our results indicate that lithospheric yield stress values lower than the present-day values (i.e., ≤100 MPa) can generate TTG volumes similar to those preserved in the rock record. The models further highlight the dominance of lithospheric dripping in producing the Archean TTGs. Large volumes of TTG melts form within the thin, tail portions of the drips as these regions are more efficiently heated by the enclosing hotter mantle. In contrast, only limited melting occurs within the thickened parts of lithosphere as they are significantly weak and cannot sustain crustal thickening for long time periods, resulting in its removal via dripping. This study, therefore, reaffirms the dominance of non-plate tectonic mechanisms in producing TTGs under the conditions that operated on the hotter Archean Earth.

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Material properties of high-strength beryllium-free copper alloys

Cited by 28 publications

References 17 publications

Ultrafine-Grained Precipitation Hardened Copper Alloys by Swaging or Accumulative Roll Bonding

Ultrafine-Grained Precipitation Hardened Copper Alloys by Swaging or Accumulative Roll Bonding

Low cycle fatigue behaviour of a precipitation hardened Cu-Ni-Si alloy

Calibrating the Yield Strength of Archean Lithosphere Based on the Volume of Tonalite-Trondhjemite-Granodiorite Crust

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